Did you ever get any answers to this? I've tried to use the Saxon XSLT processor in the same way you describe but it led to very odd behaviour within Workbench where it said all of my processes had no inputs/outputs.
Thanks Steve, some interesting ideas there. My fear is, as you suggest, this is really a custom view rather than being something that can be done easily out of the box.
To help narrow it down a little further:Is this a completely out of the box Workspace installation? Which version of Workspace (ES2/2.5/ADEP/3)?What is different about this user in terms of permissions? Are you expecting them to see an additional start point?
I'd be interested in this too - it seems the feature in Designer to customize the display of validation error messages (e.g. all in one box) is ignored by Workspace.